Bypass vs Crystal ceramic

[Balaraju Arror]

Posted on July 04, 2017 at 15:47

Hello Team,

As per STM32F769I-DISCO board schematic, I understood it should be Bypass clock source.

But default cube project gives selection as Crystal ceramic. Why it is ceramic crystal?

Request you to help me which one I should select for STM32 -DISCO board?

[Tesla DeLorean]

Posted on July 04, 2017 at 19:04

To stop OSC_OUT banging up and down, BYPASS would generally be the desirable choice. The system is going to clock if OSC_IN delivers a pulse train meeting the input requirements.

[TechGuyMike · Accepted solution]

Since NZ2520SB is not a ''Crystal/Ceramic Resonator'', but rather a crystal oscillator, you should use "BYPASS Clock Source" as the high speed clock option in CubeIDE/CubeMx.

[Tesla DeLorean]

Correct

BYPASS should have different input characteristics, and also not output a signal on OSC-OUT